The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
권호 표지
DOI QR코드

DOI QR Code

Beam Tracking Technique for Communication with Multiple Unmanned Aircraft Vehicles(UAVs)

다중 무인 항공기 통신을 위한 빔 추적 기법

  • Received : 2016.07.22
  • Accepted : 2016.10.13
  • Published : 2016.11.30
Download PDF
⟨ Previous Next ⟩

Abstract

Beamforming technique at the ground station is known to be effective in obtaining coverage extension or SNR gain for communication with unmanned aerial vehicle (UAV). When a UAV moves, periodic beam tracking is necessary to maintain beam gain. In order to track beams for multiple UAVs, the ground station needs to receive different preamble sequences from multiple UAVs. In this paper, a preamble sequence design technique is proposed for beam tracking in a GMSK-based communication system with multiple UAVs. Hadamard sequence is considered for the design of preamble sequence due to its ideal cross-correlation property. A preamble sequence appropriate for a GMSK communication system with multiple UAVs is proposed after analyzing the properties of received signal in a GMSK system with the input of Hadamard sequence.

무인 항공기와 기지국간 통신시 커버리지 확장과 SNR 이득 확보를 위하여 기지국에서의 빔 형성 기법이 효과적이다. 무인 항공기가 이동하는 상황에서는 빔 이득을 유지하기 위하여 기지국에서 무인 항공기를 향한 주기적인 빔 추적이 필요하다. 또한 다수의 무인 항공기가 이동하는 경우에는 기지국에서 빔 추적을 하기 위하여 무인 항공기에서 서로 다른 프리앰블의 전송이 필요하다. 본 논문에서는 이상적인 상호 상관 특성을 갖고 있는 Hadamard 시퀀스를 기반으로 GMSK 통신시스템에서 다수의 무인 항공기를 향한 빔 추적을 위하여 프리앰블 시퀀스 설계 기법을 제안한다. Hadamard 시퀀스를 입력으로 하는 GMSK 통신시스템에서 수신신호의 특성을 분석한 이후에 다수의 무인 항공기와 통신하는 GMSK 시스템에 적합한 프리앰블 시퀀스를 제안한다.

Keywords

References

  1. H. W. Kim and K. S. Kang, "Technical and standardization trends on control and non-payload communications for unmanned aircraft systems," Electron. and Telecommun. Trends, vol. 30, no. 3, pp. 74-83, Jun. 2015.
  2. ITU, Characteristics of unmanned aircraft systems and spectrum requirements to support their safe operation in non-segregated airspace, ITU-R M.2171, Dec. 2009.
  3. RTCA, Minimum operational performance standards (MOPS) for unmanned aircraft systems (UAS) command and control, Draft version 1.0, 2015.
  4. NASA/CR, NASA Unmanned Aircraft(UA) Control and Non-Payload Communication (CNPC) System Waveform Trade Studies, 2014-216673.
  5. K. Murota and K. Hirade, "GMSK modulation for digital mobile telephony," IEEE Trans. Commun., vol. COM-29, pp. 1044-1050, 1981.
  6. N. Al-Dhahir and G. Saulnier, "A highperformance reduced-complexity GMSK demodulator," IEEE Trans. Commun., vol. 46, pp. 1409-1412, 1998. https://doi.org/10.1109/26.729380
  7. P. A. Laurent, "Exact and approximate construction of digital phase modulations by superposition of amplitude modulated pulses," IEEE Trans. Commun., vol. COM-34, pp. 150-160, 1986.
  8. H. Zepernick and A. Finger, Pseudo Random Signal Processing: Theory and Application, John Wiley & Sons, 2005.
  9. D. W. Matolak, "Unmanned aircraft systems: Air-ground channel characterization for future applications," IEEE Veh. Technol. Mag., vol. 10, pp. 79-85, 2015. https://doi.org/10.1109/MVT.2015.2411191
  10. D. W. Matolak and R. Sun, "Air-ground channel characterization for unmanned aircraft systems: the near-urban environment," MILCOM 2015, pp. 1656-1660, Oct. 2015.
  11. L. C. Godara, Smart Antennas, CRC Press, 2004.
  12. G. K. Kaleh, "Simple coherent receivers for partial response continuous phase modulation," IEEE J. Sel. Areas on Commun., vol. 7, pp. 1427-1436, 1989. https://doi.org/10.1109/49.44586
  13. G. Colavolpe and R. Raheli, "Reducedcomplexity detection and phase synchronization of CPM signals," IEEE Trans. Commun., vol. 45, pp. 1070-1079, 1997. https://doi.org/10.1109/26.623071
  14. K. S. Kim, T. S. Lim, J. H. Choi, and Y. S. Cho, "A Tx-Rx beam tracking technique for cellular communication systems with a mmWave link," J. KICS, vol. 39A, no. 12, pp. 1-11, 2014. https://doi.org/10.7840/kics.2014.39A.1.1
  15. M. J. Kim, J. H. Choi, and Y. S. Cho, "Convergence analysis on distributed time and frequency synchronization algorithm for OFDMA-based wireless mesh networks using bio-inspired technique," J. KICS, vol. 39A, no. 8, pp. 488-490, 2014. https://doi.org/10.7840/kics.2014.39A.8.488
  16. M. J. Kim, Y. J. Lee, and Y. S. Cho, "A distributed time synchronization technique for OFDMA-based wireless mesh communication systems using bio-inspired algorithm," J. KICS, vol. 38A, no. 12, pp. 1069-1078, 2013. https://doi.org/10.7840/kics.2013.38A.12.1069